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Chelsea beat Portuguese side FC Porto 2-1 on aggregate to progress to the semi-finals of the Champions League.
Porto midfielder Sergio Oliveira believes Porto were superior to Chelsea but lost due to a lack of attention in the first-leg.
Oliveira told TVI: “It’s frustrating and sad, but it’s football. We must be proud of our journey.
“Even in this tie, we had many moments when we were superior to Chelsea.
“We were penalised with two moments of a lack of attention, but it is part of football.
“These were team mistakes, not individual ones. The Champions League is over, now we have the championship, which is our main goal.”